Marriage is a religious ceremony, why would you believe everyone you date wants to partake in such a ceremony?

Exactly.

Marriage isn't compulsory. Loads of people have happy, long-term relationships without being married. Some people just like serial dating.

Dating is good for getting to know someone.

You know how to be successful in a marriage aside from being legally binded?

To aim for a long term relationship, but without all the complications if it doesn't work out despite trying.

To have fun

That was always how I looked at it. If I didn't think we were some type of a match I wouldn't even ask the girl out.